14-17 May 2018
New Orleans
US/Central timezone

Colloid-facilitated radionuclide transport through a bead-packed column and direct simulation using lattice-Boltzmann and random walk particle tracking

16 May 2018, 17:01
2m
New Orleans

New Orleans

Poster + 3 Minute Pitch MS 4.10: Evaluation and Optimization of Non-Conservative Transport in Porous Media Parallel 8-A

Speaker

Mr Xiaolong Yin (Colorado School of Mines)

Description

It is well known that the radionuclide-carrying colloids in ground water can facilitate the transport of contaminants in the subsurface. A set of column experiments under physically and chemically heterogeneous conditions was conducted. Pore velocity was maintained below 100 cm/d and solution of CsI and silica colloids (1 micron diameter) was injected through saturated columns. At the same time, pore-scale simulation using lattice Boltzmann (LB) and random-walk particle tracking (RWPT) was used to solve the advection-diffusion equation (ADE) to match the breakthrough curves and dispersion coefficients of column experiment. With high-performance computing, we directly simulated flow and convective transport of non-adsorbing and adsorbing colloids in the entire column (L = 10.3 cm, D = 0.75 cm, resolved by 169 × 169 × 1722 voxels). We compared not only the dispersion coefficients, but also the breakthrough curves between column experiments and pore-scale simulations for the first time. The latter comparison was enabled by an algorithm that effectively maintained load balance and parallel efficiency.

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Primary authors

Mr Jae Kyoung Cho (Colorado School of Mines) Mr Xiaolong Yin (Colorado School of Mines) Mr Keith B. Neeves (Colorado School of Mines) Mr Ning Wu (Colorado School of Mines) Mr Kenton Rod (Pacific Northwest National Laboratory) Mr Wooyong Um (Pacific Northwest National Laboratory) Mr Jaehun Chun (Pacific Northwest National Laboratory)

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